Materials World Network: Nanoscale Structure and Shaping of Ferroelectric Domains

提高对铁电畴的成核和生长的理解，特别是在锂钛酸盐和钽酸锂晶体和波导中，畴结构和畴壁研究的创新方法，以及在这些材料中利用亚微米和纳米尺寸畴结构的器件的开发，是这个跨大西洋研究项目的目标，来自五个小组的贡献：西蒙·菲尔波特（佛罗里达大学），铁电畴壁的理论建模，（Lehigh University）用稀土和拉曼光谱来监测畴壁的结构和动力学，并用光辅助写入畴图案，卡斯滕·布斯（University of Bonn）利用应用泵浦和探测技术在快速和超快速时间尺度上观察畴成核，利用通过非线性过程写入亚波长畴，随着电光控制布拉格反射器的实现，（Penn州立大学）用扫描探针工具来图案化和检测域，并实现基于纳米域结构的光子带隙超棱镜，和沃尔夫冈·索勒（University of Paderbom），使用电场在锂酸盐衬底中的（脊）波导的表面和本体中写入（亚）微米畴图案，温度和光辅助极化技术，并与集成光学参量振荡器的发展与后向非线性耦合提供新的调谐和光谱特性，在中红外光谱范围。

Improved understanding of nucleation and growth of ferroelectric domains especially in lithium niobate and lithium tantalate crystals and waveguides, innovative methods for domain structuring and for domain wall investigation, as well as development of devices that utilize sub-micron- and nano-sized domain structures in these materials are the goals of this transatlantic research project with contributions from five groups: Simon Phillpot (University of Florida) with theoretical modelling of ferroelectric domain walls, Volkmar Dierolf (Lehigh University) with rareearth and Raman spectroscopy to monitor the structure and dynamics of domain walls and with light-aided writing of domain patterns, Karsten Buse (University of Bonn) with the observation of domain nucleation on the fast and ultrafast time scale applying pump-and-probe techniques, with writing of sub-wavelength domains by nonlinear processes, and with the realization of an electro-optically controlled Bragg reflector, Venkatraman Gopalan (Penn State University) with scanningprobe tools to pattern and to detect domains and with the realization of photonic band-gap superprisms based on nano-domain structures, and Wolfgang Sohler (University of Paderbom) with the writing of (sub-)micron domain patterns in the surface and in the bulk of (ridge) waveguides in lithium niobate substrates using electric field-, temperature- and light-assisted poling techniques, and with the development of integrated-optical parametrical oscillators with backward nonlinear coupling offering new tuning and spectral properties in the mid-infrared spectral range.